Method of making bilge bodies.



1 METHOD or MAKING B IIIIIIIII s. I A? IIIIIIIIIIIIII IIIIIIIII 1o aosnar w. HARDIE, of NEW YORK, n. Y.

METHOD or MAKING BILGE Booms.

Specification of Letters Patent.

Patented May 16,1911.

Original application filed January 24, 1908-, Serial No. 412,390. Divided and this application filed ilug'ust 19, 1910. Serial No. 578,087.

To all whom it may concern:

Be it known that I, ROBERT W. H-nnmn, a citizen of the United States, and a resident of the city of New York,'borough of Manhattan, in the county and State of New York, have invented, new and useful Improvements in the Method of Making Bilge Bodies, of which the following is afull', clear, and exact description.

This is a division of an application filed by me January 24, 1908, Serial No. 412,390, on which Letters Patent were issued to me October 27, 1908, No. 901,963.

In receptacles heretofore used, made of sheet metal and having a bilge-shaped body, it has been necessary to join together the ends of the sheet forming the body, by means of. an overlapping joint. This requires the ends of the sheet to be perforated and then riveted together, and the joint when finished must be sealed b brazing when the receptacle is to be use for oils, chemicals or similar liquids.

In order to avoid the expense of perforating, riveting and brazing the seam of a barrel, and in order to avoid the protruding edge of the overlapping sheet and produce a smooth surface at the joint, I have provided for welding the edges of a sheet or sheets together by means of a butt weld so as to make a smooth surface.

p In the bilge shaped receptacles heretofore made, it has been impossible to secure the edges of the sheets together by a butt welded sea-m, because in the only practical method known to me and heretofore-followed the body has beenstretched into a bilge-shaped form after it has been first formed in drum shape, and the edges of the sheets riveted together. If the edges of the sheets are welded together while in the'drum shape and the body is then stretched into a bilge shape, the welded seam is invariably broken,

and such method has been found to be im-' practical.

Efiorts have been made to form a bilge shaped metallic body by rolling a sheet of metal while hot around, a metallic former but such efforts have proven to be impractical because of the fact that the metal used in making a barrel is so thin that it is impossible to keep the metal hot while rolling it into a bilge formation, particularly whereas in s uch cases it is necessary to compress the lateral margins of the sheet into the re duced diameter required to form the ends of a bilge-shaped body. Other methods have been made to roll a sheet of metal while cold- I bilge shaped bodies with a butt-welded seam.

That object I accomplish by the means illustrated in the accompanying drawings, in which drawings like characters of referenceindicate corresponding parts throughout the several views, and in which-'- Figure 1 is a plan of a sheet metal blank having corrugations formed therein, said corrugations being deepest at the middle of the corrugations and diminishing in depth from the middle toward the opposite ends of said corrugations; Fig. 2 is a central longitudinal section taken on the line 22 of Fig. 1; Fig. 3 is a transverse section taken on the line 33 of Fig. 1; and Fig. 4: is a side elevation of the blank shownin Fig. 1,

bentinto cylindrical form, and the corrugations removed, the ends of the sheet forming the body being butt welded together.

As illustrated-in the drawings, a sheet of metal 1 is stretched into corrugations 2, the

corrugations being greatest in depth along the central longitudinal line of the sheet, or that art of the sheet designed to form the midd e of the body, and diminishing in depth from the middle toward the opposite ends of the said corrugations, as illustrated and described in LettersPatentissued to me October 27, 1908, No. 901,963. The corrugations are preferably made to terminate at or merge into the uncorrugated portion of the blank. After the metal has been stretched into corrugations, the corrugations are pressed out and the sheet bent into circular form, as shown in Fig. 4. After the body has'been stretched and bent into the form shown in Fig.4, the edges of the ends 33 of the sheet may be readily brought into juxtaposition and butt welded together,

making an absolutely tight joint 4, the

smooth surface at the joint thereby dispens ing with the cost of perforating, riveting and brazing, and making a joint in. every way superior to the overlapping riveted and' brazed joint heretofore used.

While I prefer to stretch the blank into bilge shape in the manner I have hereinshown and described, I do not desire to be limited to such construction and mode of ogeration so far as making a butt Welded joint is concerned, and other means for stretching the blank into bilge formation before butt Welding the same maybe adopted Without departing from'my invention.

Having thus describei: my invention, What I claim as new and desire to secure by Letters Patent- The method of making bilge bodies of sheet metal with a butt Welded seam, consisting in first stretching a sheet metal blank into corrugations diminishing in depth from the middle toward the opposite end of 15 said corrugations, pressing out said corrugations, bending the body into cylindrical form and outs Welding together the two ad jacentiaterai margins of said blank.

In Witness whereof I have signed my 20 name to this specification in the presence of two subscribing Witnesses.

ROBERT W. HAR-DIE. Witnesses:

JOHN BRAoHvoonL, ORsoNs Morin 

